Add include/arch/properties.h files

Will include architecture-specific properties about the kernel.
Currently they mainly hold macros for calculating where the kernel
starts and ends in physical and virtual memory.

arch/i386/include/arch/properties.h

@@ -0,0 +1,32 @@
+/*
+    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
+
+    This file is part of Aedrix.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef PROPERTIES_H
+#define PROPERTIES_H
+
+extern uint32 kernel_start_phys, kernel_end_phys;
+extern uint32 kernel_start, kernel_end;
+
+#define kernel_start_physical() &kernel_start_phys
+#define kernel_end_physical()   &kernel_end_phys
+#define kernel_start_virtual()  &kernel_start
+#define kernel_end_virtual()    &kernel_end
+
+#endif /* PROPERTIES_H */